Spanning the latter half of the 21st century, the Sol Expansion era marks a decisive pivot in human civilization: from a world-bound species reaching into orbit, to a system-spanning presence with the beginnings of permanent infrastructure beyond Earth.
Following the foundational decades of orbital consolidation and scientific exploration, this period is defined by the pragmatic exploitation of extraterrestrial environments. National programs, corporate syndicates, and emerging supranational blocs shift their attention toward resource acquisition, strategic positioning, and long-term habitation across multiple celestial bodies.
No single breakthrough defines this era. Instead, it unfolds through a patchwork of incremental advances and regional initiatives, all contributing to the steady normalization of human activity in space. Orbital shipyards, lunar smelters, Martian laboratories, and autonomous relay platforms become not marvels, but assets — embedded in economic forecasts and political doctrine.